Jul 30, 2020· The Bond Rod Mill Work Index is a measure of the resistance of the material to grinding in a rod mill It can be used to determine the grinding power required for a given throughput of material under rod mill grinding conditions It is a 'locked cycle' test conducted in closed circuit with a ,

Get PriceThe Bond ball mill work index is one of the most commonly used grindability tests in mining, and is often referred to as the Bond work index The test is a 'locked-cycle' test where ground product is removed from test cycles and replaced by fresh feed The test much achieve a ,

Get PriceRod mills normally carry 35 to 65% rod charge by volume The limits on charge level are (1) keeping the feed end trunnion open so that feed will get into the mill, and (2) keeping the rod charge low so rods will not work their way into discharge openings where they can cause rod tangling

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Get PriceBond for 50 mm >d >005 mm , W is the work index measured in a laboratory ball mill (kilowatt-hours per metric or short ton) P 80 is the mill circuit product size in micrometers; F 80 is the mill circuit feed size in micrometers Rod mill A rotating drum causes friction and attrition between steel rods and ore ,

Get PriceThe ability to simulate the Bond work index test also allows examination of truncated ball mill feed size distributions on the work index For grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill (see Figure 310), a question arises as to whether this practice will alter the ball mill work index (BW i) of the material ,

Get PriceDec 12, 2016· The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific ,

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Get PriceJan 01, 2016· A Bond ball mill work index is then performed on the mill product for the design of SAG-ball mill circuits This is important because it was found that there was a 1–15 kWh/t higher ball mill work index if the –335 mm ball mill test feed size is obtained by SAG mill ,

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Get PriceGenerally, Bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power In the current research, a simple, fast and accurate procedure is introduced to find the

Get Pricea method using Bond Indices than adding a single factor of 125 to arrive at the AG/SAG speciﬁ c energy In 1991 the Canadians developed the SAGPower Index (SPI), test using 2 kg of material in a 300 mm diameter mill This test has been further developed by Starkey, Hindstrom and Orser (2006) This test now includes a Bond Ball mill work ,

Get Price3- STANDARD BOND TESTS The Bond's standard ball mill is used to determine the work index value of differ ent sampl The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80% passing 100 µm If the breakage

Get PriceThe bond ball mill work index is one of the most commonly used grindability tests in mining and is often referred to as the bond work index the test is a lockedcycle test where ground product is removed from test cycles and replaced by fresh feed More Details

Get PriceBond Rod Mill Grindability Test The test determines the Bond Rod Mill Work Index which is used with Bond’s Third Theory of Comminution to calculate net power requirements when sizing ball mills* Various correction factors may have to be applied The test is a closed-circuit dry grindability test performed in a standard rod mill

Get PriceThis Table of Ball Mill Bond Work Index of Minerals is a summary as tested on ‘around the world sample’ You can find the SG of each mineral samples on the other table

Get PriceBond Test WI’s (kWh/t): Rod Mill: Ball Mill: 95 kWh/t8 9 kWh/t Bond Standard Circuit Work Index: Assume the rod mill Work Index of 95 applies from the actual rod mill feed sizeof 19,300 mµ (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod µ

Get PriceMay 01, 1993· The Bond rod mill test can then be modelled using a simpler bali mill model This simplifying assumption will also be probed Bond work index determinations Part 2 511 EXPERIMENTAL PROCEDURE Tests with Standard Feeds Testwork was performed with silica from Baskatong Quartz, Saint-Urbain, Qu6bec

Get PriceThe goal of this work is to create an equation to adjust a Bond ball mill work index from one P 80 basis to another The proposed model consists of two components, the variable coefficient that is determined from a specific work index determination and a fixed exponent determined by a calibration procedure

Get PriceBond ball mill grindability testthe bond ball mill work index (bbwi) test is carried out in a standardised ball mill with a pre-defined media and ore chargethe work index calculated from the testing can be used in the design and analysis of ball mill circuitsthe test requires a minimum of 10kg of sample that has been stage-crushed to

Get Priceare the Bond Work Index (Wi) values (Bond, 1952), divided into a low energy crushing work index (Wi C) for coarse rocks (75-50 mm), a rod mill work index (Wi RM) for intermediate sized particles (25-3 mm), and a ball mill work index (Wi BM) for small particles (

Get PriceBond Work Index Rod Mill Bond rod mill work index determination of the work index for ball and rod mills in 1952 and modified it in 1961 the standard bond ball mill grindability test is a closed circuit dry grinding test with a 250 circulating load the standard procedural outline of the test is stated in bond 1961 the work index for a ball mill wi is then calculated from the following

Get PriceThe Bond ball mill grindability test is run in a laboratory until a circulating load of 250% is developed It provides the Bond Ball Mill Work Index which expresses the resistance of material to ball milling This happens after 7–10 grinding cycles, which shows that the procedure is a lengthy and complex one and is therefore susceptible to ,

Get PriceThe Bond rod mill grindability test is a widely used tool to estimate the response of ores to rod milling However, the mass of ore required to conduct the test, which can typically vary from ,

Get PriceBond Ball Mill Work Index, BWi, kWh/t 134 Bond Rod Mill Work Index, RWi, kWh/t 181 Table 1 Example of AG/SAG Ball Mill Circuit Wio Calculations [1] [2] ABstrAct Optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have a large effect on profitability Mill operators have long used operating ,

Get PriceThe grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave-shaped design , (RWI) is used for particle size determination in a size range from 25 mm down to 21 mm whereas Ball Mill Work Index (BWI) is used for the range from 21 mm down to 100 µm

Get PriceMill diameter; Mineral density; Work Index Bond estimated the amount of wear in terms of kilograms per kWh based on the abrasion index, A;, ie, Wet Ball Mill = kg kWh = 016(A i-0015) 033; Dry Ball Mill = kg / kWh = 0023A i 05; Replacement Ball Size

Get PriceThe Bond low-energy impact crushing work index (more informally, the Bond crushing work index) is not as common as the Bond ball mill work index, and it is a notoriously noisy test The test is a 'per-specimen' test where individual specimens of prepared rock are hand-picked by the test operator and placed into the apparatus

Get PriceOct 19, 2017· The grinding balls diameter determined by the Bond formula has a recommendatory character and serves as a starting point for calculating the necessary proportion grinding media feeding a new mill More precisely adjust the ball load in the mill can only by industrial test performing

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